CN109321825A - A kind of 450MPa grades of automotive light weight technology cold-rolled biphase steel and its production method - Google Patents

A kind of 450MPa grades of automotive light weight technology cold-rolled biphase steel and its production method Download PDF

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Publication number
CN109321825A
CN109321825A CN201811240068.1A CN201811240068A CN109321825A CN 109321825 A CN109321825 A CN 109321825A CN 201811240068 A CN201811240068 A CN 201811240068A CN 109321825 A CN109321825 A CN 109321825A
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cold
steel
rolled biphase
rolled
rolling
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CN109321825B (en
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白海瑞
张秀飞
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Baotou Iron and Steel Group Co Ltd
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Baotou Iron and Steel Group Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236Cold rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/005Ferrite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/008Martensite

Abstract

The invention discloses a kind of 450MPa grades of automotive light weight technology cold-rolled biphase steels, component comprising following weight percent: C:0.06~0.08%, Si:0.05~0.10%, Mn:1.05~1.15%, P :≤0.010%, S :≤0.005%, Alt:0.020~0.050%, Cr:0.20~0.30%.The invention also discloses the production methods of cold-rolled biphase steel.Cold-rolled biphase steel and its production method of the invention, by parameter in optimal control component content and rolling mill practice, the ton steel production cost of obtained cold-rolled biphase steel is low, and yield tensile ratio is low, initial manufacture hardening rate is high, with good cold machine-shaping, yield strength with higher after forming;Wide market is conducive to the needs for meeting social development, and the production method of cold-rolled biphase steel of the invention, preparation method is simple, is suitble to industrialized production.

Description

A kind of 450MPa grades of automotive light weight technology cold-rolled biphase steel and its production method
Technical field
The present invention relates to metallurgical plate technical field more particularly to a kind of 450MPa grades of automotive light weight technology cold-rolled biphase steel and Its production method.
Background technique
China's automobile sales volume in 2017 breaks through 2887.89 ten thousand, the continuous 9 years residences whole world first, it is contemplated that automobile produced in 2025 Amount reaches 35,000,000.As the burst of auto output increases, environment and energy crisis are increasingly sharpened, and energy-saving and emission-reduction have become The significant problem that auto manufacturing faces.The weight for mitigating components or vehicle with modern technologies and method, pacifies ensureing Under the premise of congruent performance, realize that energy-saving and emission-reduction consumption reduction target has become common recognition by loss of weight, automotive light weight technology technology has become For the trend of current automotive industry.
Cold-rolled biphase steel is by two phase composition of ferrite and martensite, based on phase transformation strengthening, has preferable low in the wrong strong Than, high initial manufacture hardening rate, good intensity and ductility cooperate the features such as, have evolved into a kind of automobile high-strength New Type Punching Steel.Cold-rolled biphase steel is in automobile structure and covering application aspect: comparing low-alloy high-strength steel, carbon structure Steel and baking hardened steel, under the premise of same intensity rank, steel plate is thinner, becomes apparent from for automotive light weight technology weight loss effect, And yield strength with higher after shaping, make part that there is preferable concave resistance;Therefore cold-rolled biphase steel is automobile covering Preferable selection in terms of part and ordinary construction part, has broad application prospects.
Currently, cold-rolled biphase steel disclosed in the prior art, the Nb containing high level in disclosed 440MPa grades of cold-strip steel Element (0.050%) and Ti element, Nb and Ti alloy is expensive, increases ton steel cost;Contain in disclosed 450MPa cold-rolled biphase steel Si (0.3%) and Mn (1.5%) are higher, increase ton steel cost, and Si content height easily causes steel strip surface iron scale to be difficult to Removal increases pickling difficulty, and steel strip surface quality is more difficult to control, and Mn content height influences steel band welding performance;Existing skill also Cr (0.5%) and Mn (1.5%) is higher in other disclosed 450MPa cold-rolled biphase steels of art, also increases ton steel cost;Therefore, 450MPa grades of automotive light weight technology cold-rolled biphase steel novel to Optimal Development improves two-phase steel quality and optimizes the production of dual phase steel There is an urgent need for method.
Therefore, those skilled in the art is dedicated to developing a kind of 450MPa grades of automotive light weight technology cold-rolled biphase steel and its life Production method.
Summary of the invention
In view of the drawbacks described above of the prior art, the technical problem to be solved by the present invention is to 450MPa grades of vapour in the prior art Vehicle lightweight cold-rolled biphase steel Nb element (0.050%) and Ti, Si constituent content are high, and ton steel cost is high, steel strip surface quality compared with It is difficult to control.
To achieve the above object, the present invention provides a kind of 450MPa grades of automotive light weight technology cold-rolled biphase steel, it includes with The component of lower weight percent: C:0.06~0.08%, Si:0.05~0.10%, Mn:1.05~1.15%, P :≤ 0.010%, S :≤0.005%, Alt:0.020~0.050%, Cr:0.20~0.30%.
In better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of C is 0.068%;
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of C is 0.071%;
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of C is 0.08%;
In better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Si is 0.05%;
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Si is 0.07%;
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Si is 0.10%;
In better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Mn is 1.08%;
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Mn is 1.10%;
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Mn is 1.12%;
In better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of P is 0.005%;
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of P is 0.008%;
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of P is 0.010%;
In better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of S is 0.002%;
In better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of S is 0.003%;
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Alt is 0.030%;
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Alt is 0.045%;
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Alt is 0.050%;
In better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Cr is 0.23%;
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Cr is 0.25%;
In another better embodiment of the invention, the cold-rolled biphase steel includes that the weight percent of Cr is 0.30%;
Another aspect of the present invention provides a kind of production method of 450MPa grades of automotive light weight technology cold-rolled biphase steel, including will Slab carries out hot rolling, pickling and cold-rolling and continuous annealing treatment and obtains the 450MPa grades of automotive light weight technology cold-rolled biphase steel.
Further, the production method of the 450MPa grades of automotive light weight technology cold-rolled biphase steel, specific steps include:
Step 1, smelting and continuous casting: carrying out converter smelting using the molten iron of desulfurization pretreatment makes molten steel decarburization, dephosphorization, carries out Cleaning, slow cooling, obtain slab after LF refining and sheet billet continuous casting;
Step 2, hot rolling: by the laggard horizontal high voltage water dephosphorization of heating of plate blank, hot-strip is obtained after roughing and finish rolling;
Step 3, pickling and cold-rolling: by the hot-strip after hot rolling through chlorohydric acid pickling, with the cooling velocity of 20~25 DEG C/s For cooling temperature to 650 DEG C, cold rolling obtains cold-rolled strip coil of strip;
Step 4, annealing: 800 ± 20 DEG C will be heated to after the band uncoiling of cold-strip steel coil, 80~120S be kept the temperature, with 3~5 DEG C/speed of s is cooled to 680 ± 20 DEG C, 280 ± 20 DEG C then are cooled to the cooling velocity greater than 45 DEG C/s, Wetted constructures It is cooled to 150 DEG C after 400~500S eventually, is air-cooled to room temperature and obtains the 450MPa grades of automotive light weight technology cold-rolled biphase steel.
Further, the production method of the cold-rolled biphase steel, in the step 1, converter smelting tapping temperature is 1630 ~1650 DEG C;
Further, the production method of the cold-rolled biphase steel in the step 1, refines temperature >=1560 DEG C in place;
Further, the production method of the cold-rolled biphase steel, in the step 2, slab heating temperature is 1220~ 1235 DEG C, heating time is 220~235min;
Further, the production method of the cold-rolled biphase steel, in the step 2, the start rolling temperature of finish rolling is 1030~ 1040℃;
Further, the production method of the cold-rolled biphase steel, in the step 2, the finishing temperature of finish rolling is 860~ 880℃;
Further, the production method of the cold-rolled biphase steel, in the step 2, hot-strip is with a thickness of 4mm;
Further, the production method of the cold-rolled biphase steel, in the step 3, cold rolling reduction ratio is 62.5%;
Further, the production method of the cold-rolled biphase steel, in the step 3, cold-rolled strip coil of strip is with a thickness of 1.5mm;
Using above scheme, cold-rolled biphase steel disclosed by the invention and its production method are had following technical effect that
(1) cold-rolled biphase steel of the invention, ingredient are free of expensive metal Nb and Ti, and Si content is low lower than 0.1%, Cr content In 0.30%, and Mn content is lower than 1.15%, reduces a ton steel production cost, is relatively easy to control steel strip surface quality;
(2) cold-rolled biphase steel of the invention, microscopic structure be ferrite+martensite, Martensite Volume Fraction be 9%~ 12%, about 11.5 grades of grain size, there is low yield strength ratio, high initial manufacture hardening rate, good intensity and ductility matching etc. Feature, meets the needs of automotive light weight technology selection, and mechanical property and processing performance meet the requirement of GB/T20564.2-2006;
(3) cold-rolled biphase steel of the invention, in automobile structure and covering application aspect, compared to low-alloy high-strength steel, Structural carbon steel and baking hardened steel, under the premise of same intensity rank, steel plate is thinner, is automotive light weight technology weight loss effect It becomes apparent from, while the yield tensile ratio of cold-rolled biphase steel is low, initial manufacture hardening rate is high, has good cold machine-shaping, at Yield strength with higher after shape makes part that there is preferable concave resistance and high shock to absorb energy, while being not required to add The noble metals such as Nb, Mo reduce cost of alloy, wide market.
In conclusion cold-rolled biphase steel and its production method of the invention, pass through optimal control component content and rolling The parameters such as heating temperature, rolling temperature in technique, obtained cold-rolled biphase steel ton steel production cost, yield tensile ratio is low, initial manufacture Hardening rate is high, has good cold machine-shaping, yield strength with higher after forming;There is part preferable anti- Concavity can absorb energy with high shock, and wide market is conducive to the needs for meeting social development, cold rolling two-phase of the invention The production method of steel, preparation method is simple, is suitble to industrialized production.
Make below with reference to technical effect of the specific embodiment to design of the invention, specific structure and generation further Illustrate, to fully understand the purposes, features and effects of the present invention.
Detailed description of the invention
Fig. 1 is 1 cold-rolled biphase steel micro-organization chart of the embodiment of the present invention;
Specific embodiment
The preferred embodiment of the present invention introduced below keeps its technology contents more clear and is easy to understand.The present invention can be with It is emerged from by many various forms of embodiments, protection scope of the present invention is not limited only to the implementation mentioned in text Example.
The preparation of embodiment 1, cold-rolled biphase steel
Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained molten steel, converter using top and bottom combined blown converter smelting The whole Argon of smelting, steel scrap addition converter, 1640 DEG C of Tapping Temperature of Bof.Then molten steel after converter smelting is subjected to essence outside LF furnace Refining refines temperature >=1560 DEG C in place, and LF external refining carries out thermometric and trimming, and LF external refining is for casting machine chemical component As shown in table 1.The sheet billet continuous casting degree of superheat is 20 DEG C, carries out slab cleaning, slow cooling and continuous casting billet quality inspection later, obtains plate Base;
Slab heating temperature is 1235 DEG C, heating time 220min, and the slab after heating is carried out high pressure water dephosphorization.It is logical Fixed-width pressure machine fixed width is crossed, using 2 rack roughing, 7 rack CVC finish rolling.1030 DEG C of finish rolling start rolling temperature, finish rolling finishing temperature is 860 DEG C, obtain hot-strip, finished product thickness 4.0mm;
Section cooling is cooling using front, and 20 DEG C/s of cooling velocity, temperature of steel strips is reduced to 650 DEG C and is batched.It will be hot Strip is rolled through hydrochloric acid trough pickling, which uses the i-BOX technology of MH recent development, and operation and maintenance greatly simplifies, and saves energy Source and labour, after hot-strip removes scale on surface, by 5 rack UCM milling train cold rollings, cold rolling reduction ratio is 62.5%, it is rolled to target thickness 1.5mm, obtains cold-rolled strip coil of strip;
The continuous annealing of cold-rolled strip coil of strip carries out in the vertical continuous annealing furnace with HGJC function, and steel band is run in furnace area Speed is 120m/min, 800 DEG C of soaking temperature, soaking time 120S, 680 DEG C of rapid cooling start temperature, 45 DEG C/S of rapid cooling cooling rate, mistake 282 DEG C of aging temp, overaging time 440S, 150 DEG C of final cooling temperature, smooth elongation percentage 1.0%, be air-cooled to room temperature obtain it is described 450MPa grades of automotive light weight technology cold-rolled biphase steels.
Embodiment 2
Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained molten steel, converter using top and bottom combined blown converter smelting The whole Argon of smelting, steel scrap addition converter, 1630 DEG C of Tapping Temperature of Bof.Then molten steel after converter smelting is subjected to essence outside LF furnace Refining refines temperature >=1560 DEG C in place, and LF external refining carries out thermometric and trimming, and LF external refining is for casting machine chemical component As shown in table 1.The sheet billet continuous casting degree of superheat is 25 DEG C, carries out slab cleaning, slow cooling and continuous casting billet quality inspection later, obtains plate Base;
Slab heating temperature is 1230 DEG C, and the time of heating is 230min, and the slab after heating is carried out high pressure water dephosphorization. By fixed-width pressure machine fixed width, using 2 rack roughing, 7 rack CVC finish rolling.1040 DEG C of finish rolling start rolling temperature, finish rolling finishing temperature It is 870 DEG C, obtains hot-strip, finished product thickness 4.0mm.
Section cooling is cooling using front, and 25 DEG C/s of cooling velocity, temperature of steel strips is reduced to 650 DEG C and is batched.It will be hot Strip is rolled through hydrochloric acid trough pickling, which uses the i-BOX technology of MH recent development, and operation and maintenance greatly simplifies, and saves energy Source and labour, after hot-strip removes scale on surface, by 5 rack UCM milling train cold rollings, cold rolling reduction ratio is 62.5%, it is rolled to target thickness 1.5mm, obtains cold-rolled strip coil of strip;
The continuous annealing of cold-rolled strip coil of strip carries out in the vertical continuous annealing furnace with HGJC function, and steel band is run in furnace area Speed is 150m/min, 820 DEG C of soaking temperature, soaking time 100S, 680 DEG C of rapid cooling start temperature, 50 DEG C/S of rapid cooling cooling rate, mistake 291 DEG C of aging temp, overaging time 400S, 150 DEG C of final cooling temperature, smooth elongation percentage 1.0%, be air-cooled to room temperature obtain it is described 450MPa grades of automotive light weight technology cold-rolled biphase steels.
Embodiment 3
Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained molten steel, converter using top and bottom combined blown converter smelting The whole Argon of smelting, steel scrap addition converter, 1650 DEG C of Tapping Temperature of Bof.Then molten steel after converter smelting is subjected to essence outside LF furnace Refining refines temperature >=1560 DEG C in place, and LF external refining carries out thermometric and trimming, and LF external refining is for casting machine chemical component As shown in table 1.The sheet billet continuous casting degree of superheat is 30 DEG C, carries out slab cleaning, slow cooling and continuous casting billet quality inspection later, obtains plate Base;
Slab heating temperature is 1220 DEG C, and the time of heating is 235min, and the slab after heating is carried out high pressure water dephosphorization. By fixed-width pressure machine fixed width, using 2 rack roughing, 7 rack CVC finish rolling.1030 DEG C of finish rolling start rolling temperature, finish rolling finishing temperature It is 879 DEG C, obtains hot-strip, finished product thickness 4.0mm obtains cold-rolled strip coil of strip;
Section cooling is cooling using front, and 23 DEG C/s of cooling velocity, temperature of steel strips is reduced to 650 DEG C and is batched.It will be hot Strip is rolled through hydrochloric acid trough pickling, which uses the i-BOX technology of MH recent development, and operation and maintenance greatly simplifies, and saves energy Source and labour, after hot-strip removes scale on surface, by 5 rack UCM milling train cold rollings, cold rolling reduction ratio is 62.5%, it is rolled to target thickness 1.5mm;
The continuous annealing of cold-rolled strip coil of strip carries out in the vertical continuous annealing furnace with HGJC function, and steel band is run in furnace area Speed 140m/min is 812 DEG C of holding temperature, soaking time 108S, 680 DEG C of rapid cooling start temperature, rapid cooling cooling rate 55 DEG C/S, out-of-date 285 DEG C of temperature, overaging time 460S, 150 DEG C of final cooling temperature of effect, smooth elongation percentage 1.0%, be air-cooled to room temperature obtain it is described 450MPa grades of automotive light weight technology cold-rolled biphase steels.
The cold-rolled biphase steel constituent content that detection Examples 1 to 3 obtains, the results are shown in Table 1.
1 unit of table: %
Embodiment C Si Mn P S Alt Cr
1 0.080 0.05 1.08 0.010 0.003 0.045 0.23
2 0.071 0.10 1.10 0.008 0.003 0.030 0.25
3 0.068 0.07 1.12 0.005 0.002 0.050 0.23
Mechanical properties test is carried out to the cold-rolled biphase steel that the embodiment of the present invention 1~3 obtains, inspection result is shown in Table 2.
Table 2
As can be seen from Table 2, the yield tensile ratio for the cold-rolled biphase steel that the embodiment of the present invention 1~3 obtains is 0.55~0.58, elongation percentage It is 29%~30%, tensile strength is 515~529MPa, and the cold-rolled biphase steel that the expression embodiment of the present invention 1~3 obtains has low Yield tensile ratio, high initial manufacture hardening rate, good intensity and ductility matching;
The cold-rolled biphase steel obtained to inventive embodiments 1 is observed, and microscopic structure is as shown in Figure 1, microscopic structure is Ferrite+martensite, Martensite Volume Fraction are 9%~12%, and about 11.5 grades of grain size, the display embodiment of the present invention 1 obtains Cold-rolled biphase steel it is high-quality.
Other technologies scheme of the present invention also has similar beneficial effect.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that the ordinary skill of this field is without wound The property made labour, which according to the present invention can conceive, makes many modifications and variations.Therefore, all technician in the art Pass through the available technology of logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea Scheme, all should be within the scope of protection determined by the claims.

Claims (7)

1. a kind of 450MPa grades of automotive light weight technology cold-rolled biphase steel, which is characterized in that the component comprising following weight percent: C: 0.06~0.08%, Si:0.05~0.10%, Mn:1.05~1.15%, P :≤0.010%, S :≤0.005%, Alt: 0.020~0.050%, Cr:0.20~0.30%.
2. a kind of production method of 450MPa grades of automotive light weight technology cold-rolled biphase steel, which is characterized in that including slab is carried out heat It rolls, pickling and cold-rolling and continuous annealing treatment obtain the 450MPa grades of automotive light weight technology cold-rolled biphase steel.
3. method as claimed in claim 2, which is characterized in that the specific steps of the production method include:
Step 1, smelting and continuous casting: carrying out converter smelting using the molten iron of desulfurization pretreatment makes molten steel decarburization, dephosphorization, carries out LF essence Cleaning, slow cooling, obtain slab after refining and sheet billet continuous casting;
Step 2, hot rolling: by the laggard horizontal high voltage water dephosphorization of heating of plate blank, hot-strip is obtained after roughing and finish rolling;
Step 3, pickling and cold-rolling: cooling with the cooling velocity of 20~25 DEG C/s by the hot-strip after hot rolling through chlorohydric acid pickling For temperature to 650 DEG C, cold rolling obtains cold-rolled strip coil of strip;
Step 4, annealing: will be heated to 800 ± 20 DEG C after chill volume steel band uncoiling, 80~120S be kept the temperature, with the speed of 3~5 DEG C/s Degree is cooled to 680 ± 20 DEG C, is then cooled to 280 ± 20 DEG C with the cooling velocity greater than 45 DEG C/s, 400~500S of Wetted constructures It is cooled to 150 DEG C eventually afterwards, is air-cooled to room temperature and obtains the 450MPa grades of automotive light weight technology cold-rolled biphase steel.
4. method as claimed in claim 3, which is characterized in that in the step 1,
Converter smelting tapping temperature is 1630~1650 DEG C;Refine temperature >=1560 DEG C in place.
5. method as claimed in claim 3, which is characterized in that in the step 2,
Slab heating temperature is 1220~1235 DEG C, and heating time is 220~235min;
The start rolling temperature of finish rolling is 1030~1040 DEG C;
The finishing temperature of finish rolling is 860~880 DEG C;
Hot-strip is with a thickness of 4mm.
6. method as claimed in claim 3, which is characterized in that in the step 3,
Cold rolling reduction ratio is 62.5%;
Cold-rolled strip coil of strip is with a thickness of 1.5mm.
7. the cold-rolled biphase steel that a kind of any one of claim 2~6 the method produces, which is characterized in that the cold rolling Dual phase steel includes the component of following weight percent: C:0.06~0.08%, Si:0.05~0.10%, Mn:1.05~ 1.15%, P :≤0.010%, S :≤0.005%, Alt:0.020~0.050%, Cr:0.20~0.30%.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110042320A (en) * 2019-05-27 2019-07-23 包头钢铁(集团)有限责任公司 A kind of 500MPa grades of automotive light weight technology cold-rolled biphase steel and preparation method thereof
CN111485177A (en) * 2020-04-19 2020-08-04 包头钢铁(集团)有限责任公司 Low-cost 780 MPa-grade cold-rolled dual-phase steel and production method thereof

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CN104694818A (en) * 2015-03-26 2015-06-10 攀钢集团西昌钢钒有限公司 Production method for carbon structural steel cold-roll steel sheets
CN108411202A (en) * 2018-04-03 2018-08-17 本钢板材股份有限公司 A kind of think gauge cold-rolled biphase steel and preparation method thereof

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CN104694818A (en) * 2015-03-26 2015-06-10 攀钢集团西昌钢钒有限公司 Production method for carbon structural steel cold-roll steel sheets
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Publication number Priority date Publication date Assignee Title
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